US5377629A - Adaptive manifold tuning - Google Patents

Adaptive manifold tuning Download PDF

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Publication number
US5377629A
US5377629A US08/139,370 US13937093A US5377629A US 5377629 A US5377629 A US 5377629A US 13937093 A US13937093 A US 13937093A US 5377629 A US5377629 A US 5377629A
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US
United States
Prior art keywords
induction air
intake passage
air intake
resonator
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/139,370
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English (en)
Inventor
Stephen E. Brackett
Dennis E. Houle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Canada Ltd
Original Assignee
Siemens Electric Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Electric Ltd filed Critical Siemens Electric Ltd
Priority to US08/139,370 priority Critical patent/US5377629A/en
Assigned to SIEMENS ELECTRIC LIMITED reassignment SIEMENS ELECTRIC LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRACKETT, STEPHEN E., HOULE, DENNIS E.
Priority to DE69406804T priority patent/DE69406804T2/de
Priority to EP94926744A priority patent/EP0724684B1/de
Priority to PCT/CA1994/000502 priority patent/WO1995011373A1/en
Application granted granted Critical
Publication of US5377629A publication Critical patent/US5377629A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0247—Plenum chambers; Resonance chambers or resonance pipes
    • F02B27/0263—Plenum chambers; Resonance chambers or resonance pipes the plenum chamber and at least one of the intake ducts having a common wall, and the intake ducts wrap partially around the plenum chamber, i.e. snail-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/008—Resonance charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0205—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the charging effect
    • F02B27/021—Resonance charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0247—Plenum chambers; Resonance chambers or resonance pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • This invention relates to induction systems for internal combustion engines, and it is particularly concerned with tuning of engine manifolds by means of resonators.
  • Typical intake manifold geometries provide an engine torque-speed characteristic that has a peak torque at a certain engine speed. Over a range of engine speeds beyond that certain engine speed, the torque dips.
  • the present invention is directed toward reducing, or even eliminating, such a dip.
  • the present invention relates to a new and improved Helmholtz resonator that can provide adaptive manifold tuning for the purpose of improving engine performance. More specifically, this aspect of the invention relates to endowing the neck of a Helmholtz resonator with means for selectively setting the effective transverse cross sectional area of communication that the neck provides between the Helmholtz resonator chamber and the air intake passage of the engine induction system.
  • the selective setting is accomplished by an obturator, or valve, that is selectively positioned by an actuator to selectively restrict the neck opening.
  • the actuator is under the control of one or more engine operating parameters, such as engine speed.
  • FIG. 1 is a somewhat schematic diagram of an internal combustion engine induction system which includes the adaptive manifold tuning of the present invention.
  • FIG. 2 is a perspective view of an induction system having the adaptive manifold tuning.
  • FIG. 3 is a fragmentary view of a portion of FIG. 2 with certain portions having been sectioned away to illustrate internal features:
  • FIG. 4 is a transverse view as taken in the direction of arrows 4--4 in FIG. 3.
  • FIG. 5 is a perspective view of another embodiment.
  • FIG. 6 is a graph that illustrates representative improvement that can be obtained with the adaptive manifold tuning of the invention.
  • FIG. 1 A representative induction system 10 for an internal combustion engine 12 is shown in FIG. 1.
  • Induction system 10 comprises an induction air intake passage 14 that contains a butterfly-valve type throttle 16 for selectively throttling induction air flow.
  • Intake passage 14 leads to a plenum chamber 18, and from plenum chamber 18 there are a number of runners 20 for delivering induction air to individual combustion chambers of engine 12.
  • the adaptive manifold tuning of the present invention comprises a Helmholtz resonator 22 associated with induction system 10.
  • Helmholtz resonator 22 comprises a resonator chamber 24 that is placed in communication with intake passage 14 at a location that is downstream of throttle 16 but upstream of plenum chamber 18. Communication is established by means of a neck 26 of Helmholtz resonator 22.
  • the invention relates to means for selectively setting the effective transverse cross-sectional area of communication that neck 26 provides between chamber 24 and intake passage 14.
  • This means comprises an obturator, or valve, 28 that is operated by an actuator 30, which is itself operated in accordance with one or more parameters representative of the operation of engine 12.
  • actuator 30 is controlled as a function only of speed of engine 12, but it is possible that other control strategies may involve one or more other parameters with or without engine speed.
  • Engine speed information may be derived from any conventional source of engine speed that may be available.
  • the Helmholtz principle is a function of not only the effective transverse cross-sectional area of communication provided by neck 26, but also of the length of the neck and the volume of resonator chamber 24, the torque improvement that can be obtained in any given engine is a function of three parameters.
  • the volume of resonator chamber 24 is fixed, as is the length of neck 26, but it is contemplated that more elaborate tuning systems could have means to vary these parameters as well as the effective transverse cross-sectional area of communication provided by neck 26.
  • FIGS. 2-4 depict constructional detail for the schematic system described in FIG. 1. Like reference numerals designate like parts in FIG. 1-4.
  • Intake passage 14 is shown in FIGS. 2-4 as a circular walled tube that merges axially into one end of plenum chamber 18.
  • Plenum chamber 18 and resonator chamber 24 are arranged generally side-by-side; however, resonator chamber 24 axially overlaps both intake passage 14 and plenum chamber 18 such that a portion of intake passage 14 immediately adjoining plenum chamber 18 is juxtaposed generally side-by-side with the portion of resonator chamber 24 that overlaps it, while the remaining portion of resonator chamber 24 is juxtaposed side-by-side with plenum chamber 18.
  • Runners 20 extend from a side of plenum chamber 18 to wrap partially around a side of resonator chamber 24.
  • the runners terminate in a mounting flange 32 that attaches to engine 12.
  • Flange 32 and an immediately joining short segment of each runner overhang from resonator chamber 24 so as to overlie both plenum chamber 18 and air intake passage 14, as perhaps best seen in FIG. 4.
  • Obturator 28 is a slide that is contained within a compartment 34 that forms neck 26.
  • the location where the neck opens to intake passage 14 is designated 36 while the location where the neck opens to resonator chamber 24 is designated 38.
  • the height of the neck is designated 39.
  • the obturator selectively obturates the neck opening in accordance with the extent that it is slid in a plane that is transverse to the length of the neck.
  • Compartment 34 is large enough to contain obturator 28 and to accommodate the range over which it can slide.
  • Obturator 28 comprises a flat planar body 40 of generally rectangular shape that is bounded on three sides by a flange 42. The flange provides guidance for the sliding motion of the obturator within the compartment.
  • flange 42 is curved to match the curvature of the exterior of a portion of a wall 44 that extents from opening 36 in the direction of the plenum chamber to form portions of the wall of intake passage 14 and plenum chamber 18 where the two merge.
  • obturator 28 can be selectively extended and retracted in a direction parallel to the transverse cross-sectional area of communication that is provided by neck 26 to thereby set the effective transverse cross-sectional area of communication that the neck provides between resonator chamber 24 and intake passage 14.
  • actuator 30 Positioning of obturator 28 is accomplished by a rod 46 of actuator 30.
  • actuator 30 may be a vacuum operated servo-type actuator as perhaps best seen in FIG. 3.
  • Actuator 30 is mounted in a wall member 48 that forms a closure for that end of compartment 34.
  • intake passage 14, plenum chamber 18, runners 20, and Helmholtz resonator 22 may be fabricated as a unitary part.
  • Obturator 28 and actuator 30 are assembled into the unitary part.
  • the Helmholtz resonator with adaptive tuning feature of the invention may be embodied in a separate assembly that can be in-line mounted in the air intake passage.
  • An example of such an assembly is shown in FIG. 5. It comprises flanges 50, 52 providing for the in-line mounting of the assembly in the air intake passage, and a body 54 that is between these flanges and houses the obturator, while forming the neck of the Helmholtz resonator leading to the resonator chamber.
  • the actuator rod 46 extends through body 54 to the actuator, which is not shown, but is external to the body.
  • Helmholtz resonator While it is preferred that the Helmholtz resonator have communication with the induction system downstream of the throttle, it is possible that such communication may take place upstream of the throttle.
  • An advantage of having the resonator communicate with the induction system downstream of the throttle is that at part throttle conditions, the torque curve is significantly improved with lower loss in wide open throttle torque.
  • FIG. 6 graphs engine output torque in non-dimensional units versus engine speed.
  • a first graph plot 60 is a baseline for a particular engine without the adaptive manifold tuning feature of the invention.
  • a second graph plot 62 is for the same engine but with the adaptive tuning feature and with a particular size Helmholtz resonator chamber.
  • a third graph plot 66 is for the same engine also with adaptive tuning feature but with a different size Helmholtz resonator chamber. It can be seen that definite torque improvements can be obtained with the invention. Obviously, the nature and extent of improvement will depend on a number of factors, and in any given application of the invention, it may be necessary to vary different factors to get the best improvement that is obtainable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Characterised By The Charging Evacuation (AREA)
US08/139,370 1993-10-20 1993-10-20 Adaptive manifold tuning Expired - Lifetime US5377629A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/139,370 US5377629A (en) 1993-10-20 1993-10-20 Adaptive manifold tuning
DE69406804T DE69406804T2 (de) 1993-10-20 1994-09-19 Adaptives abgestimmtes saugrohr
EP94926744A EP0724684B1 (de) 1993-10-20 1994-09-19 Adaptives abgestimmtes saugrohr
PCT/CA1994/000502 WO1995011373A1 (en) 1993-10-20 1994-09-19 Adaptive manifold tuning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/139,370 US5377629A (en) 1993-10-20 1993-10-20 Adaptive manifold tuning

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US5377629A true US5377629A (en) 1995-01-03

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US08/139,370 Expired - Lifetime US5377629A (en) 1993-10-20 1993-10-20 Adaptive manifold tuning

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Country Link
US (1) US5377629A (de)
EP (1) EP0724684B1 (de)
DE (1) DE69406804T2 (de)
WO (1) WO1995011373A1 (de)

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5560330A (en) * 1992-05-16 1996-10-01 Filterwerk Mann & Hummel Gmbh Intake manifold and process for making it
WO1997008433A1 (de) * 1995-08-30 1997-03-06 Marco Herr Ansaugsystem für eine kolbenbrennkraftmaschine
US5628287A (en) * 1994-09-30 1997-05-13 Siemens Electric Limited Adjustable configuration noise attenuation device for an air induction system
US5771851A (en) * 1997-07-29 1998-06-30 Siemens Electric Limited Variably tuned Helmholtz resonator with linear response controller
US5930371A (en) * 1997-01-07 1999-07-27 Nelson Industries, Inc. Tunable acoustic system
US6009705A (en) * 1995-11-06 2000-01-04 Tennex Europe Limited Noise attenuator for an induction system or an exhaust system
US6135079A (en) * 1996-05-08 2000-10-24 Filterwerk Mann & Hummel Gmbh Air intake system for an internal combustion engine
US6295363B1 (en) 1997-03-20 2001-09-25 Digisonix, Inc. Adaptive passive acoustic attenuation system
US6302752B1 (en) * 1998-07-29 2001-10-16 Yamaha Hatsudoki Kabushiki Kaisha Induction system for watercraft engine
US6370879B1 (en) * 1998-11-10 2002-04-16 Alstom Damping device for reducing the vibration amplitude of acoustic waves for a burner
US6517397B1 (en) 1999-09-24 2003-02-11 Sanshin Kogyo Kabushiki Kaisha Air induction system for small watercraft
US6544084B1 (en) 1999-06-17 2003-04-08 Yamaha Hatsudoki Kabushiki Kaisha Induction system for small watercraft
US20030178248A1 (en) * 2002-03-22 2003-09-25 Siemens Vdo Automotive, Inc. Combined active noise control and resonator
FR2841602A1 (fr) 2002-06-27 2004-01-02 Renault Sa Moteur a combustion interne muni d'un resonateur de helmholtz integre a un circuit de recirculation des gaz d'echappement qui est connecte a un circuit d'admission d'air
EP1388653A1 (de) * 2002-08-06 2004-02-11 OFFICINE METALLURGICHE G. CORNAGLIA S.p.A. Resonator mit variabler Geometrie für ein Luftansaugkanalsystem einer Brennkraftmaschine, und damit versehene Luftansauganlage
US20040071546A1 (en) * 2002-10-11 2004-04-15 Juergen Werner Radial blower for a leaf and waste collection/removal apparatus with operating noise suppression means
US6758304B1 (en) * 1999-09-16 2004-07-06 Siemens Vdo Automotive Inc. Tuned Helmholtz resonator using cavity forcing
US6792907B1 (en) 2003-03-04 2004-09-21 Visteon Global Technologies, Inc. Helmholtz resonator
US20040253886A1 (en) * 2003-06-12 2004-12-16 Tetsuya Mashiko Intake manifold for small watercraft
US20050199439A1 (en) * 2004-03-12 2005-09-15 Visteon Global Technologies, Inc. Variable geometry resonator for acoustic control
US20050205354A1 (en) * 2004-03-19 2005-09-22 Visteon Global Technologies, Inc. Dual chamber variable geometry resonator
US20050204730A1 (en) * 2004-03-16 2005-09-22 Kojyu Tsukahara Engine with a charging system
US20050217626A1 (en) * 2004-03-30 2005-10-06 Toyoda Gosei Co., Ltd Resonator
US20050252716A1 (en) * 2004-05-14 2005-11-17 Visteon Global Technologies, Inc. Electronically controlled dual chamber variable resonator
US20050279335A1 (en) * 2004-06-16 2005-12-22 Shigeyuki Ozawa Water jet propulsion boat
EP1640601A1 (de) * 2004-09-28 2006-03-29 Magneti Marelli Powertrain S.p.A. Einlasskrümmer mit Luftbehälter für eine Brennkraftmaschine
WO2006045986A2 (fr) * 2004-10-28 2006-05-04 Renault S.A.S Moteur comportant un circuit d'admission d'air prevu pour l'optimisation du rendement volumetrique
US7055484B2 (en) * 2002-01-18 2006-06-06 Carrier Corporation Multiple frequency Helmholtz resonator
US20070044747A1 (en) * 2005-08-26 2007-03-01 Toyoda Gosei Co., Ltd. Air intake sound control structure
US20070079796A1 (en) * 2005-09-26 2007-04-12 Shigeharu Mineo Installation structure for compressor
EP1826392A1 (de) * 2006-02-27 2007-08-29 MAHLE Filter Systems Japan Corporation Saugvorrichtung und Saugrohr für einen Verbrennungsmotor
US20070289653A1 (en) * 2006-05-23 2007-12-20 Harris Ralph E Gas Compressor With Side Branch Absorber For Pulsation Control
US20080023261A1 (en) * 2004-05-14 2008-01-31 Yanmar Co., Ltd. Noise Proof Structure of Cabin
US20080066999A1 (en) * 2006-09-15 2008-03-20 John David Kostun Continuously variable tuned resonator
US20080253900A1 (en) * 2007-04-11 2008-10-16 Harris Ralph E Gas compressor with pulsation absorber for reducing cylinder nozzle resonant pulsation
US7458369B2 (en) 2004-09-14 2008-12-02 Yamaha Marine Kabushiki Kaisha Supercharger lubrication structure
US20090007876A1 (en) * 2007-07-03 2009-01-08 Anthony Charles Arruda Air induction system with resonator bypass valve
US20100307143A1 (en) * 2009-06-05 2010-12-09 Anthony Colette IC power plant, and method of operation
US20110155504A1 (en) * 2008-09-30 2011-06-30 Hitachi, Ltd. Silencing equipment for electric devices
US8123498B2 (en) 2008-01-24 2012-02-28 Southern Gas Association Gas Machinery Research Council Tunable choke tube for pulsation control device used with gas compressor
US8727070B2 (en) 2010-06-16 2014-05-20 Alstom Technology Ltd Helmholtz damper and method for regulating the resonance frequency of a Helmholtz damper
US10027070B1 (en) 2017-02-28 2018-07-17 Fca Us Llc HVIL plug assembly
US10066589B2 (en) 2017-02-09 2018-09-04 Fca Us Llc Independent intake runner resonator system

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DE19539078A1 (de) * 1995-10-20 1997-04-24 Mann & Hummel Filter Saugrohr
DE10004991A1 (de) * 2000-02-04 2001-08-09 Volkswagen Ag Helmholtz-Resonator mit variabler Resonanzfrequenz
US8516987B2 (en) 2005-09-15 2013-08-27 Litens Automotive Partnership Intake manifold having runners with variable cross sectional area
EP2397760B1 (de) 2010-06-16 2020-11-18 Ansaldo Energia IP UK Limited Dämpfungsanordnung und Verfahren zu deren Entwurf

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GB2031999A (en) * 1978-10-02 1980-04-30 Ifa Motorenwerke Air induction manifold for an internal combustion engine
US4546733A (en) * 1983-03-22 1985-10-15 Nippondenso Co., Ltd. Resonator for internal combustion engines
JPH0215925A (ja) * 1988-07-01 1990-01-19 Isuzu Motors Ltd 歯車強化方法
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JPH03107522A (ja) * 1989-09-22 1991-05-07 Mitsubishi Heavy Ind Ltd 内燃機関の吸気管

Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5560330A (en) * 1992-05-16 1996-10-01 Filterwerk Mann & Hummel Gmbh Intake manifold and process for making it
US5628287A (en) * 1994-09-30 1997-05-13 Siemens Electric Limited Adjustable configuration noise attenuation device for an air induction system
WO1997008433A1 (de) * 1995-08-30 1997-03-06 Marco Herr Ansaugsystem für eine kolbenbrennkraftmaschine
WO1997008434A1 (de) * 1995-08-30 1997-03-06 Marco Herr Ansaugsystem für eine kolbenbrennkraftmaschine
US6009705A (en) * 1995-11-06 2000-01-04 Tennex Europe Limited Noise attenuator for an induction system or an exhaust system
US6135079A (en) * 1996-05-08 2000-10-24 Filterwerk Mann & Hummel Gmbh Air intake system for an internal combustion engine
US5930371A (en) * 1997-01-07 1999-07-27 Nelson Industries, Inc. Tunable acoustic system
US6295363B1 (en) 1997-03-20 2001-09-25 Digisonix, Inc. Adaptive passive acoustic attenuation system
US5771851A (en) * 1997-07-29 1998-06-30 Siemens Electric Limited Variably tuned Helmholtz resonator with linear response controller
US6302752B1 (en) * 1998-07-29 2001-10-16 Yamaha Hatsudoki Kabushiki Kaisha Induction system for watercraft engine
US6370879B1 (en) * 1998-11-10 2002-04-16 Alstom Damping device for reducing the vibration amplitude of acoustic waves for a burner
US6544084B1 (en) 1999-06-17 2003-04-08 Yamaha Hatsudoki Kabushiki Kaisha Induction system for small watercraft
US6758304B1 (en) * 1999-09-16 2004-07-06 Siemens Vdo Automotive Inc. Tuned Helmholtz resonator using cavity forcing
US6517397B1 (en) 1999-09-24 2003-02-11 Sanshin Kogyo Kabushiki Kaisha Air induction system for small watercraft
US7055484B2 (en) * 2002-01-18 2006-06-06 Carrier Corporation Multiple frequency Helmholtz resonator
US20030178248A1 (en) * 2002-03-22 2003-09-25 Siemens Vdo Automotive, Inc. Combined active noise control and resonator
FR2841602A1 (fr) 2002-06-27 2004-01-02 Renault Sa Moteur a combustion interne muni d'un resonateur de helmholtz integre a un circuit de recirculation des gaz d'echappement qui est connecte a un circuit d'admission d'air
EP1388653A1 (de) * 2002-08-06 2004-02-11 OFFICINE METALLURGICHE G. CORNAGLIA S.p.A. Resonator mit variabler Geometrie für ein Luftansaugkanalsystem einer Brennkraftmaschine, und damit versehene Luftansauganlage
US20040071546A1 (en) * 2002-10-11 2004-04-15 Juergen Werner Radial blower for a leaf and waste collection/removal apparatus with operating noise suppression means
US6792907B1 (en) 2003-03-04 2004-09-21 Visteon Global Technologies, Inc. Helmholtz resonator
US20040253886A1 (en) * 2003-06-12 2004-12-16 Tetsuya Mashiko Intake manifold for small watercraft
US7247067B2 (en) 2003-06-12 2007-07-24 Yamaha Marine Kabushiki Kaisha Co., Ltd. Intake manifold for small watercraft
US20050199439A1 (en) * 2004-03-12 2005-09-15 Visteon Global Technologies, Inc. Variable geometry resonator for acoustic control
US7337877B2 (en) 2004-03-12 2008-03-04 Visteon Global Technologies, Inc. Variable geometry resonator for acoustic control
US20050204730A1 (en) * 2004-03-16 2005-09-22 Kojyu Tsukahara Engine with a charging system
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WO1995011373A1 (en) 1995-04-27
EP0724684B1 (de) 1997-11-12
DE69406804D1 (de) 1997-12-18
DE69406804T2 (de) 1998-03-19
EP0724684A1 (de) 1996-08-07

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